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href="/categories/Web-APIs%E7%AC%94%E8%AE%B0/">Web APIs笔记</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span data-flag-title="Web APIs第三天"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="twikoo_visitors"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h2 id="DOM节点操作-重绘与回流"><a href="#DOM节点操作-重绘与回流" class="headerlink" title="DOM节点操作 重绘与回流"></a>DOM节点操作 重绘与回流</h2><h3 id="1-DOM节点"><a href="#1-DOM节点" class="headerlink" title="1. DOM节点"></a>1. DOM节点</h3><ol><li>DOM节点: DOM树里每一个内容都称之为节点</li></ol><img src="" data-lazy-src="https://cdn1.tianli0.top/gh/web-xc/iMG@main/postss/dom节点.jpg" style="zoom:25%"><h5 id="1-节点类型"><a href="#1-节点类型" class="headerlink" title="1. 节点类型:"></a>1. 节点类型:</h5><ol><li>元素节点 • 所有的标签 比如 body、 div • html 是根节点</li><li>属性节点 • 所有的属性 比如 href</li><li>文本节点 • 所有的文本</li><li>重点记住元素节点, 可以更好的让我们理清标签元素之间的关系</li></ol><h3 id="1-查找节点"><a href="#1-查找节点" class="headerlink" title="1. 查找节点"></a>1. 查找节点</h3><h4 id="1-查找父节点"><a href="#1-查找父节点" class="headerlink" title="1.查找父节点:"></a>1.查找父节点:</h4><ol><li>parentNode 属性, 返回最近一级的父节点 找不到返回为null</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;box1&quot;</span>&gt;</span>你好<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line">&lt;/div&gt;</span><br><span class="line"><span class="comment">// 1. parentNode 查找父节点</span></span><br><span class="line"><span class="keyword">let</span> num = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.box1&#x27;</span>)</span><br><span class="line">num.<span class="property">parentNode</span>.<span class="property">style</span>.<span class="property">display</span> = <span class="string">&#x27;none&#x27;</span></span><br></pre></td></tr></table></figure><ol start="2"><li>关闭二维码案例:</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">img</span> <span class="attr">src</span>=<span class="string">&quot;images/1.png&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">i</span> <span class="attr">class</span>=<span class="string">&quot;box1&quot;</span>&gt;</span>x<span class="tag">&lt;/<span class="name">i</span>&gt;</span></span></span><br><span class="line"><span class="language-xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="comment">//点击关闭按钮， 关闭的是二维码的盒子， 还要获取erweima盒子</span></span><br><span class="line"><span class="comment">//点击关闭按钮， 直接关闭它的爸爸，就无需获取erweima元素了</span></span><br><span class="line"><span class="keyword">let</span> num = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.box1&#x27;</span>)</span><br><span class="line">num.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">this</span>.<span class="property">parentNode</span>.<span class="property">style</span>.<span class="property">display</span> = <span class="string">&#x27;none&#x27;</span></span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><ol start="3"><li>关闭多个二维码案例</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;box1&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">span</span> <span class="attr">class</span>=<span class="string">&quot;box2&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">span</span>&gt;</span></span></span><br><span class="line">&lt;/div&gt;</span><br><span class="line"><span class="comment">//多个二维码，点击谁，谁关闭</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.box2&#x27;</span>)</span><br><span class="line"><span class="comment">// 绑定多个事件给box3</span></span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> num2 = <span class="number">0</span>; num2 &lt; num1.<span class="property">length</span>; num2++) &#123;</span><br><span class="line">    num1[num2].<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line"><span class="comment">// 关闭当前二维码 点击谁 就关闭父元素</span></span><br><span class="line">        <span class="variable language_">this</span>.<span class="property">parentNode</span>.<span class="property">style</span>.<span class="property">display</span> = <span class="string">&#x27;none&#x27;</span></span><br><span class="line">    &#125;)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h4 id="2-查找子节点"><a href="#2-查找子节点" class="headerlink" title="2. 查找子节点"></a>2. 查找子节点</h4><ol><li>childNodes: 获得所有子节点、包括文本节点(空格、换行)、注释节点等</li><li>children[重点]: 仅获得所有元素节点, 返回的还是一个伪数组</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. 查找子节点 children 伪元素</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;button&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> num2 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;ul&#x27;</span>)</span><br><span class="line">num1.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">let</span> num3 = <span class="number">0</span>; num3 &lt; num2.<span class="property">children</span>.<span class="property">length</span>; num3++) &#123;</span><br><span class="line">        num2.<span class="property">children</span>[num3].<span class="property">style</span>.<span class="property">color</span> = <span class="string">&#x27;green&#x27;</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h4 id="3-兄弟关系查找"><a href="#3-兄弟关系查找" class="headerlink" title="3. 兄弟关系查找"></a>3. 兄弟关系查找</h4><h5 id="1-下一个兄弟节点"><a href="#1-下一个兄弟节点" class="headerlink" title="1. 下一个兄弟节点"></a>1. 下一个兄弟节点</h5><ol><li>nextElementSibling 属性</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.btn&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> num2 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.two&#x27;</span>)</span><br><span class="line">num1.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line"><span class="comment">// 1.查找下一个节点</span></span><br><span class="line">num2.<span class="property">nextElementSibling</span>.<span class="property">style</span>.<span class="property">color</span> = <span class="string">&#x27;red&#x27;</span></span><br></pre></td></tr></table></figure><h5 id="2-上一个兄弟节点"><a href="#2-上一个兄弟节点" class="headerlink" title="2. 上一个兄弟节点"></a>2. 上一个兄弟节点</h5><ol><li>previousElementSibling 属性</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 2 查找上一个节点</span></span><br><span class="line">num2.<span class="property">previousElementSibling</span>.<span class="property">style</span>.<span class="property">color</span> = <span class="string">&#x27;pink&#x27;</span></span><br></pre></td></tr></table></figure><h3 id="2-增加节点"><a href="#2-增加节点" class="headerlink" title="2. 增加节点"></a>2. 增加节点</h3><h4 id="1-创建节点"><a href="#1-创建节点" class="headerlink" title="1. 创建节点"></a>1. 创建节点</h4><ol><li>即创造出一个新的网页元素，再添加到网页内，一般先创建节点，然后插入节点</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num2 = <span class="variable language_">document</span>.<span class="title function_">createElement</span>(<span class="string">&#x27;li&#x27;</span>)</span><br><span class="line">num2.<span class="property">innerHTML</span> = <span class="string">&#x27;我是创建新节点/追加节点&#x27;</span></span><br></pre></td></tr></table></figure><h4 id="2-追加节点"><a href="#2-追加节点" class="headerlink" title="2. 追加节点"></a>2. 追加节点</h4><ol><li>要想在界面看到, 还得插入到某个父元素中</li></ol><h5 id="1-插入到父元素的最后一个子元素"><a href="#1-插入到父元素的最后一个子元素" class="headerlink" title="1. 插入到父元素的最后一个子元素:"></a>1. 插入到父元素的最后一个子元素:</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;ul&#x27;</span>)</span><br><span class="line">num1.<span class="title function_">appendChild</span>(num2)</span><br></pre></td></tr></table></figure><h5 id="2-插入到父元素中某个子元素的前面"><a href="#2-插入到父元素中某个子元素的前面" class="headerlink" title="2. 插入到父元素中某个子元素的前面:"></a>2. 插入到父元素中某个子元素的前面:</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">num1.<span class="title function_">insertBefore</span>(num2, num1.<span class="property">children</span>[<span class="number">0</span>])</span><br></pre></td></tr></table></figure><h5 id="3-学成在线案例渲染"><a href="#3-学成在线案例渲染" class="headerlink" title="3. 学成在线案例渲染"></a>3. 学成在线案例渲染</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> data = [</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="attr">src</span>: <span class="string">&#x27;images/course01.png&#x27;</span>,</span><br><span class="line">        <span class="attr">title</span>: <span class="string">&#x27;Think PHP 5.0 博客系统实战项目演练&#x27;</span>,</span><br><span class="line">        <span class="attr">num</span>: <span class="number">1125</span></span><br><span class="line">    &#125;</span><br><span class="line"><span class="keyword">let</span> num2 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;ul&#x27;</span>)</span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> num1 = <span class="number">0</span>; num1 &lt; data.<span class="property">length</span>; num1++) &#123;</span><br><span class="line">    <span class="keyword">let</span> num3 = <span class="variable language_">document</span>.<span class="title function_">createElement</span>(<span class="string">&#x27;li&#x27;</span>)</span><br><span class="line">    num3.<span class="property">innerHTML</span> = <span class="string">`</span></span><br><span class="line"><span class="string">        &lt;img src=<span class="subst">$&#123;data[num1].src&#125;</span> alt=&quot;&quot;&gt;</span></span><br><span class="line"><span class="string">            &lt;h4&gt;</span></span><br><span class="line"><span class="string">                <span class="subst">$&#123;data[num1].title&#125;</span></span></span><br><span class="line"><span class="string">            &lt;/h4&gt;</span></span><br><span class="line"><span class="string">            &lt;div class=&quot;info&quot;&gt;</span></span><br><span class="line"><span class="string">                &lt;span&gt;高级&lt;/span&gt; • &lt;span&gt; <span class="subst">$&#123;data[num1].num&#125;</span>&lt;/span&gt;人在学习</span></span><br><span class="line"><span class="string">            &lt;/div&gt;</span></span><br><span class="line"><span class="string">    `</span></span><br><span class="line">    num2.<span class="title function_">appendChild</span>(num3)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h4 id="3-克隆节点"><a href="#3-克隆节点" class="headerlink" title="3. 克隆节点"></a>3. 克隆节点</h4><ol><li>cloneNode会克隆出一个跟原标签一样的元素，括号内传入布尔值</li><li>若为true，则代表克隆时会包含后代节点一起克隆</li><li>若为false，则代表克隆时不包含后代节点, 默认为false</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;ul&#x27;</span>)</span><br><span class="line"><span class="comment">// 括号默认为false 则不克隆后代节点</span></span><br><span class="line"><span class="comment">// 若是true 则克隆后代</span></span><br><span class="line"><span class="keyword">let</span> num2 = num1.<span class="title function_">cloneNode</span>(<span class="literal">true</span>)</span><br><span class="line"><span class="variable language_">document</span>.<span class="property">body</span>.<span class="title function_">appendChild</span>(num2)</span><br></pre></td></tr></table></figure><h4 id="4-删除节点"><a href="#4-删除节点" class="headerlink" title="4. 删除节点"></a>4. 删除节点</h4><ol><li>若一个节点在页面中已不需要时，可以删除它</li><li>在 JavaScript 原生DOM操作中，要删除元素必须通过父元素删除</li><li>如不存在父子关系则删除不成功</li><li>删除节点和隐藏节点（display:none） 有区别的： 隐藏节点还是存在的，但是删除，则从html中删除节点</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num3 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;button&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> num4 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;ol&#x27;</span>)</span><br><span class="line">num3.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line"><span class="comment">// 语法: 父元素.removeChild(子元素)</span></span><br><span class="line">    num4.<span class="title function_">removeChild</span>(num4.<span class="property">children</span>[<span class="number">0</span>])</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h3 id="3-时间对象"><a href="#3-时间对象" class="headerlink" title="3. 时间对象"></a>3. 时间对象</h3><ol><li>时间对象：用来表示时间的对象, 作用：可以得到当前系统时间</li></ol><h4 id="1-实例化"><a href="#1-实例化" class="headerlink" title="1. 实例化"></a>1. 实例化</h4><ol><li>在代码中发现了 new 关键字时，一般将这个操作称为实例化</li><li>创建一个时间对象并获取时间</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 小括号为空 可获得当前时间</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="keyword">new</span> <span class="title class_">Date</span>()</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(num1)</span><br><span class="line"><span class="comment">// 小括号写时间 可返回指定时间</span></span><br><span class="line"><span class="keyword">let</span> num2 = <span class="keyword">new</span> <span class="title class_">Date</span>(<span class="string">&#x27;2023-3-31 00:00&#x27;</span>)</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(num2)</span><br></pre></td></tr></table></figure><h4 id="2-时间对象方法"><a href="#2-时间对象方法" class="headerlink" title="2. 时间对象方法"></a>2. 时间对象方法</h4><ol><li>因为时间对象返回的数据我们不能直接使用，所以需要转换为实际开发中常用的格式</li></ol><table><thead><tr><th align="left">方法</th><th align="left">作用</th><th align="left">说明</th></tr></thead><tbody><tr><td align="left">getFullYear()</td><td align="left">获得年份</td><td align="left">获取四位年份</td></tr><tr><td align="left">getMonth()</td><td align="left">获得月份</td><td align="left">取值为0~11</td></tr><tr><td align="left">getDate()</td><td align="left">获得月份中的每一天</td><td align="left">不同月份取值也不同</td></tr><tr><td align="left">getDay()</td><td align="left">获取星期</td><td align="left">取值为0~6</td></tr><tr><td align="left">getHours()</td><td align="left">获取小时</td><td align="left">取值为0~23</td></tr><tr><td align="left">getMinutes()</td><td align="left">获取分钟</td><td align="left">取值为0~59</td></tr><tr><td align="left">getSeconds()</td><td align="left">获取秒</td><td align="left">取值为0~59</td></tr></tbody></table><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 年月日</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="title function_">getFullYear</span>())</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="title function_">getMonth</span>() + <span class="number">1</span>)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="title function_">getDate</span>())</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="title function_">getDay</span>())</span><br><span class="line"><span class="comment">// 时分秒</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="title function_">getHours</span>())</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="title function_">getMinutes</span>())</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="title function_">getSeconds</span>())</span><br></pre></td></tr></table></figure><h5 id="页面显示时间"><a href="#页面显示时间" class="headerlink" title="页面显示时间:"></a>页面显示时间:</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. 显示时间案例</span></span><br><span class="line"><span class="title function_">fn</span>() <span class="comment">// 先调用函数 省去1秒空白期</span></span><br><span class="line"><span class="built_in">setInterval</span>(fn, <span class="number">1000</span>)</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">fn</span>(<span class="params"></span>) &#123;</span><br><span class="line"><span class="comment">// 实例化时间对象 写到定时器里才行</span></span><br><span class="line">    <span class="keyword">let</span> arr = [<span class="string">&#x27;星期日&#x27;</span>, <span class="string">&#x27;星期一&#x27;</span>, <span class="string">&#x27;星期二&#x27;</span>, <span class="string">&#x27;星期三&#x27;</span>, <span class="string">&#x27;星期四&#x27;</span>, <span class="string">&#x27;星期五&#x27;</span>, <span class="string">&#x27;星期六&#x27;</span>]</span><br><span class="line">    <span class="keyword">let</span> num3 = <span class="keyword">new</span> <span class="title class_">Date</span>()</span><br><span class="line">    <span class="keyword">let</span> n1 = num3.<span class="title function_">getFullYear</span>()</span><br><span class="line">    <span class="keyword">let</span> n2 = num3.<span class="title function_">getMonth</span>() + <span class="number">1</span></span><br><span class="line">    <span class="keyword">let</span> n3 = num3.<span class="title function_">getDate</span>()</span><br><span class="line">    <span class="keyword">let</span> n4 = num3.<span class="title function_">getDay</span>()</span><br><span class="line">    <span class="keyword">let</span> n5 = num3.<span class="title function_">getHours</span>()</span><br><span class="line">    <span class="keyword">let</span> n6 = num3.<span class="title function_">getMinutes</span>()</span><br><span class="line">    <span class="keyword">let</span> n7 = num3.<span class="title function_">getSeconds</span>()</span><br><span class="line">    <span class="keyword">let</span> n8 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.box&#x27;</span>)</span><br><span class="line">    n8.<span class="property">innerHTML</span> = <span class="string">`今天是<span class="subst">$&#123;n1&#125;</span>年<span class="subst">$&#123;n2&#125;</span>月<span class="subst">$&#123;n3&#125;</span>日 <span class="subst">$&#123;arr[n4]&#125;</span> <span class="subst">$&#123;n5&#125;</span>:<span class="subst">$&#123;n6&#125;</span>:<span class="subst">$&#123;n7&#125;</span>`</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h4 id="3-时间戳"><a href="#3-时间戳" class="headerlink" title="3. 时间戳"></a>3. 时间戳</h4><ol><li>时间戳: 是指1970年1月1日0时0分0秒起至现在的毫秒数, 它是一种特殊的计量时间的方式</li><li>时间对象里面的方法转换实际所用</li><li>重点记住 +new Date() 因为可以返回当前时间戳或者指定的时间戳</li></ol><h4 id="1-三种方式获取时间戳"><a href="#1-三种方式获取时间戳" class="headerlink" title="1. 三种方式获取时间戳:"></a>1. 三种方式获取时间戳:</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 无需实例化</span></span><br><span class="line"><span class="comment">// 但是只能得到当前的时间戳， 而前面两种可以返回指定时间的时间戳</span></span><br><span class="line"><span class="comment">// 利用将来时间减 现在时间戳 = 剩余时间毫秒</span></span><br><span class="line"><span class="comment">// 1.getTime() 方法</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="keyword">new</span> <span class="title class_">Date</span>()</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(num1.<span class="title function_">getTime</span>())</span><br><span class="line"></span><br><span class="line"><span class="comment">// 2.new +Date()</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(+<span class="keyword">new</span> <span class="title class_">Date</span>()) <span class="comment">// 当前时间戳</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(+<span class="keyword">new</span> <span class="title class_">Date</span>(<span class="string">&#x27;2023-4-1 00:00:00&#x27;</span>)) <span class="comment">// 指定时间</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 3.Date.now 只能得到当前</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">write</span>(<span class="title class_">Date</span>.<span class="title function_">now</span>())</span><br></pre></td></tr></table></figure><h4 id="2-毕业倒计时效果"><a href="#2-毕业倒计时效果" class="headerlink" title="2. 毕业倒计时效果"></a>2. 毕业倒计时效果</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"><span class="title function_">fn</span>()</span><br><span class="line"><span class="built_in">setInterval</span>(fn, <span class="number">1000</span>)</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">fn</span>(<span class="params"></span>) &#123;</span><br><span class="line">    <span class="comment">// 1.获取当前时间戳</span></span><br><span class="line">    <span class="keyword">let</span> n1 = +<span class="keyword">new</span> <span class="title class_">Date</span>()</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 2.获取指定时间戳</span></span><br><span class="line">    <span class="keyword">let</span> n2 = +<span class="keyword">new</span> <span class="title class_">Date</span>(<span class="string">&#x27;2023-4-1 00:00:00&#x27;</span>)</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 3.计算剩余毫秒 / 1000 = 剩余秒数</span></span><br><span class="line">    <span class="keyword">let</span> n3 = (n2 - n1) / <span class="number">1000</span></span><br><span class="line">    <span class="comment">// console.log(n3)</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">// 4.转换时分秒</span></span><br><span class="line">    <span class="keyword">let</span> h = <span class="built_in">parseInt</span>(n3 / <span class="number">60</span> / <span class="number">60</span> % <span class="number">24</span>)</span><br><span class="line">    h = h &lt; <span class="number">10</span> ? <span class="string">&#x27;0&#x27;</span> + h : h</span><br><span class="line">    <span class="keyword">let</span> m = <span class="built_in">parseInt</span>(n3 / <span class="number">60</span> % <span class="number">60</span>)</span><br><span class="line">    m = m &lt; <span class="number">10</span> ? <span class="string">&#x27;0&#x27;</span> + m : m</span><br><span class="line">    <span class="keyword">let</span> s = <span class="built_in">parseInt</span>(n3 % <span class="number">60</span>)</span><br><span class="line">    s = s &lt; <span class="number">10</span> ? <span class="string">&#x27;0&#x27;</span> + s : s</span><br><span class="line">    <span class="comment">// console.log(h, m, s)</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">let</span> m1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;#hour&#x27;</span>)</span><br><span class="line">    <span class="keyword">let</span> m2 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;#minutes&#x27;</span>)</span><br><span class="line">    <span class="keyword">let</span> m3 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;#scond&#x27;</span>)</span><br><span class="line">    m1.<span class="property">innerHTML</span> = h</span><br><span class="line">    m2.<span class="property">innerHTML</span> = m</span><br><span class="line">    m3.<span class="property">innerHTML</span> = s</span><br><span class="line">    </span><br><span class="line">    <span class="keyword">let</span> m4 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.next&#x27;</span>)</span><br><span class="line">    <span class="keyword">let</span> m5 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.tips&#x27;</span>)</span><br><span class="line">    <span class="keyword">let</span> m6 = <span class="keyword">new</span> <span class="title class_">Date</span>()</span><br><span class="line">    <span class="keyword">let</span> m7 = m6.<span class="title function_">getFullYear</span>()</span><br><span class="line">    <span class="keyword">let</span> m8 = m6.<span class="title function_">getMonth</span>() + <span class="number">1</span></span><br><span class="line">    <span class="keyword">let</span> m9 = m6.<span class="title function_">getDate</span>()</span><br><span class="line">    <span class="keyword">let</span> m10 = m6.<span class="title function_">getHours</span>()</span><br><span class="line">    <span class="keyword">let</span> m11 = m6.<span class="title function_">getMinutes</span>()</span><br><span class="line">    <span class="keyword">let</span> m12 = m6.<span class="title function_">getSeconds</span>()</span><br><span class="line">    m4.<span class="property">innerHTML</span> = <span class="string">`今天是<span class="subst">$&#123;m7&#125;</span>年<span class="subst">$&#123;m8&#125;</span>月<span class="subst">$&#123;m9&#125;</span>日`</span></span><br><span class="line">    m5.<span class="property">innerHTML</span> = <span class="string">`现在是<span class="subst">$&#123;m10&#125;</span>:<span class="subst">$&#123;m11&#125;</span>:<span class="subst">$&#123;m12&#125;</span>`</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h3 id="4-重绘和回流"><a href="#4-重绘和回流" class="headerlink" title="4. 重绘和回流"></a>4. 重绘和回流</h3><blockquote><p><strong>浏览器是如何进行界面渲染的:</strong></p></blockquote><ol><li>解析（Parser）HTML，生成DOM树(DOM Tree)</li><li>同时解析（Parser） CSS，生成样式规则 (Style Rules)</li><li>根据DOM树和样式规则，生成渲染树(Render Tree)</li><li>进行布局 Layout(回流&#x2F;重排):根据生成的渲染树，得到节点的几何信息(位置，大小)</li><li>进行绘制 Painting(重绘): 根据计算和获取的信息进行整个页面的绘制</li><li>Display: 展示在页面上</li></ol><img src="" data-lazy-src="https://cdn1.tianli0.top/gh/web-xc/iMG@main/postss/重绘与回流.jpg" style="zoom:33%"><h4 id="1-回流-重排"><a href="#1-回流-重排" class="headerlink" title="1. 回流(重排)"></a>1. 回流(重排)</h4><ol><li>当 Render Tree 中部分或者全部元素的尺寸、结构、布局等发生改变时，浏览器就会重新渲染部分或全部文档的过 程称为 回流</li></ol><h4 id="2-重绘"><a href="#2-重绘" class="headerlink" title="2. 重绘"></a>2. 重绘</h4><ol><li>由于节点(元素)的样式的改变并不影响它在文档流中的位置和文档布局时(比如：color、background-color、 outline等), 称为重绘</li></ol><h4 id="3-重绘不一定引起回流-而回流一定会引起重绘"><a href="#3-重绘不一定引起回流-而回流一定会引起重绘" class="headerlink" title="3. 重绘不一定引起回流, 而回流一定会引起重绘"></a>3. 重绘不一定引起回流, 而回流一定会引起重绘</h4><h4 id="4-重绘和回流-重排-会导致回流的操作："><a href="#4-重绘和回流-重排-会导致回流的操作：" class="headerlink" title="4. 重绘和回流(重排) 会导致回流的操作："></a>4. 重绘和回流(重排) 会导致回流的操作：</h4><ol><li>页面的首次刷新</li><li>浏览器的窗口大小发生改变</li><li>元素的大小或位置发生改变</li><li>改变字体的大小</li><li>内容的变化（如：input框的输入，图片的大小)</li><li>激活css伪类(如：:hover)</li><li>脚本操作DOM（添加或者删除可见的DOM元素)</li><li>简单理解影响到布局了，就会有回流</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> s = <span class="variable language_">document</span>.<span class="property">body</span>.<span class="property">style</span></span><br><span class="line">s.<span class="property">padding</span> = <span class="string">&#x27;1px&#x27;</span> <span class="comment">// 重排 + 重绘</span></span><br><span class="line">s.<span class="property">border</span> = <span class="string">&#x27;1px solid red&#x27;</span> <span class="comment">// 重排 + 重绘</span></span><br><span class="line">s.<span class="property">color</span> = <span class="string">&#x27;red&#x27;</span> <span class="comment">// 重绘</span></span><br><span class="line">s.<span class="property">backgroundColor</span> = <span class="string">&#x27;#000&#x27;</span> <span class="comment">// 重绘</span></span><br><span class="line">s.<span class="property">fontSize</span> = <span class="string">&#x27;14px&#x27;</span> <span class="comment">// 重排 + 重绘</span></span><br></pre></td></tr></table></figure><h3 id="5-发布微博案例"><a href="#5-发布微博案例" class="headerlink" title="5. 发布微博案例"></a>5. 发布微博案例</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> data = [</span><br><span class="line">  &#123; <span class="attr">uname</span>: <span class="string">&#x27;鲁班&#x27;</span>, <span class="attr">imgSrc</span>: <span class="string">&#x27;./images/9.5/01.jpg&#x27;</span> &#125;,</span><br><span class="line">  &#123; <span class="attr">uname</span>: <span class="string">&#x27;李白&#x27;</span>, <span class="attr">imgSrc</span>: <span class="string">&#x27;./images/9.5/02.jpg&#x27;</span> &#125;</span><br><span class="line">]</span><br><span class="line"><span class="comment">// 1. 检测用户输入字数</span></span><br><span class="line"><span class="keyword">let</span> text = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;textarea&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> useCount = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.useCount&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> ul = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;#list&#x27;</span>)</span><br><span class="line">text.<span class="title function_">addEventListener</span>(<span class="string">&#x27;input&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">  useCount.<span class="property">innerHTML</span> = <span class="variable language_">this</span>.<span class="property">value</span>.<span class="property">length</span></span><br><span class="line">&#125;)</span><br><span class="line"></span><br><span class="line"><span class="comment">// 2. 发布内容不能为空</span></span><br><span class="line"><span class="comment">// 点击button后判断 内容为空 则提示不能输入为空 并直接return 不能为空</span></span><br><span class="line"><span class="comment">// 使用字符串.trim()去掉首尾空格</span></span><br><span class="line"><span class="comment">// 并将表单value值设置为空字符串 同时字数设置为0</span></span><br><span class="line"><span class="keyword">let</span> send = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;#send&#x27;</span>)</span><br><span class="line">send.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">  <span class="keyword">if</span> (text.<span class="property">value</span>.<span class="title function_">trim</span>() === <span class="string">&#x27;&#x27;</span>) &#123;</span><br><span class="line">    text.<span class="property">value</span> = <span class="string">&#x27;&#x27;</span></span><br><span class="line">    useCount.<span class="property">innerHTML</span>  = <span class="number">0</span></span><br><span class="line">    <span class="keyword">return</span> <span class="title function_">alert</span>(<span class="string">&#x27;内容不能为空&#x27;</span>)</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="comment">// 4. 发布随机数</span></span><br><span class="line">  <span class="keyword">function</span> <span class="title function_">fn</span>(<span class="params">min, max</span>) &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="title class_">Math</span>.<span class="title function_">floor</span>(<span class="title class_">Math</span>.<span class="title function_">random</span>() * (max - min + min) + min)</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="keyword">let</span> fn1 = <span class="title function_">fn</span>(<span class="number">0</span>, data.<span class="property">length</span>)</span><br><span class="line"></span><br><span class="line">  <span class="comment">// 3. 新增留言</span></span><br><span class="line">  <span class="comment">// 创建小li 通过innerHTML追加数据</span></span><br><span class="line">  <span class="comment">// 随机获取数据数组内容 替换图片名字及留言内容</span></span><br><span class="line">  <span class="comment">// 利用时间对象将时间动态化 new Date().toLocaleString()</span></span><br><span class="line">  <span class="keyword">let</span> li = <span class="variable language_">document</span>.<span class="title function_">createElement</span>(<span class="string">&#x27;li&#x27;</span>)</span><br><span class="line">  li.<span class="property">innerHTML</span> = <span class="string">`</span></span><br><span class="line"><span class="string">    &lt;div class=&quot;info&quot;&gt;</span></span><br><span class="line"><span class="string">      &lt;img class=&quot;userpic&quot; src=<span class="subst">$&#123;data[fn1].imgSrc&#125;</span> /&gt;</span></span><br><span class="line"><span class="string">      &lt;span class=&quot;username&quot;&gt;<span class="subst">$&#123;data[fn1].uname&#125;</span>&lt;/span&gt;</span></span><br><span class="line"><span class="string">      &lt;p class=&quot;send-time&quot;&gt;发布于 <span class="subst">$&#123;<span class="keyword">new</span> <span class="built_in">Date</span>().toLocaleString()&#125;</span>&lt;/p&gt;</span></span><br><span class="line"><span class="string">    &lt;/div&gt;</span></span><br><span class="line"><span class="string">      &lt;div class=&quot;content&quot;&gt;<span class="subst">$&#123;text.value&#125;</span>&lt;/div&gt;</span></span><br><span class="line"><span class="string">      &lt;span class=&quot;the_del&quot;&gt;X&lt;/span&gt;</span></span><br><span class="line"><span class="string">  `</span></span><br><span class="line"></span><br><span class="line">  <span class="comment">// 5. 删除留言操作 放到追加的前面</span></span><br><span class="line">  <span class="comment">// 在事件处理函数里获取点击按钮 注册点击事件</span></span><br><span class="line">  <span class="comment">// 易错点: 必须在事件里获取 外面获取不到</span></span><br><span class="line">  <span class="comment">// 放到追加ul的前面 创建元素同时顺便绑定了事件</span></span><br><span class="line">  <span class="keyword">let</span> del = li.<span class="title function_">querySelector</span>(<span class="string">&#x27;.the_del&#x27;</span>)</span><br><span class="line">  del.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    ul.<span class="title function_">removeChild</span>(li)</span><br><span class="line">  &#125;)</span><br><span class="line"></span><br><span class="line">  <span class="comment">// 追加给ul 用父元素.insertBefore(子元素, 元素前面)</span></span><br><span class="line">  ul.<span class="title function_">insertBefore</span>(li, ul.<span class="property">children</span>[<span class="number">0</span>])</span><br><span class="line"></span><br><span class="line">  <span class="comment">// 6. 重置表单域内容为空</span></span><br><span class="line">  text.<span class="property">value</span> = <span class="string">&#x27;&#x27;</span></span><br><span class="line">  useCount.<span class="property">innerHTML</span> = <span class="number">0</span></span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><hr><h4 id="本节单词"><a href="#本节单词" class="headerlink" title="本节单词:"></a>本节单词:</h4><ol><li>parentNode</li><li>children</li><li>nextElementSibling</li><li>previousElementSibling</li><li>createElement</li><li>appendChild</li><li>insertBefore</li><li>cloneNode</li><li>removeChild</li><li>new Date</li><li>getTime</li><li>now</li><li>FullYear</li><li>Month</li><li>Day</li><li>Hours</li><li>Minutes</li><li>Seconds</li><li>trim</li><li>toLocaleString</li></ol></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">本文作者:</span> <span class="post-copyright-info"><a href="https://webxc.eu.org">XC's Blog</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">本文链接:</span> <span class="post-copyright-info"><a href="https://webxc.eu.org/post/df7d/">https://webxc.eu.org/post/df7d/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明:</span> <span class="post-copyright-info">本博客所有文章除特别声明外，均采用 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class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">原网站因使用.ml域名被回收, 再加上本人因学习原因, 没怎么打理博客, 使用了https://webxc.eu.org域名来维持博客运行, 如果有加友联的朋友们, 去友联页看信息即可, 如果原来有加过的, 麻烦在原来域名后缀改一下(.ml ==> .eu.org)就行, 博客写的太乱了, 没时间打理, 兄弟们谅解😁😁~~</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#DOM%E8%8A%82%E7%82%B9%E6%93%8D%E4%BD%9C-%E9%87%8D%E7%BB%98%E4%B8%8E%E5%9B%9E%E6%B5%81"><span class="toc-number">1.</span> <span class="toc-text">DOM节点操作 重绘与回流</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-DOM%E8%8A%82%E7%82%B9"><span class="toc-number">1.1.</span> <span class="toc-text">1. DOM节点</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#1-%E8%8A%82%E7%82%B9%E7%B1%BB%E5%9E%8B"><span class="toc-number">1.1.0.1.</span> <span class="toc-text">1. 节点类型:</span></a></li></ol></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-%E6%9F%A5%E6%89%BE%E8%8A%82%E7%82%B9"><span class="toc-number">1.2.</span> <span class="toc-text">1. 查找节点</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E6%9F%A5%E6%89%BE%E7%88%B6%E8%8A%82%E7%82%B9"><span class="toc-number">1.2.1.</span> <span class="toc-text">1.查找父节点:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-%E6%9F%A5%E6%89%BE%E5%AD%90%E8%8A%82%E7%82%B9"><span class="toc-number">1.2.2.</span> <span class="toc-text">2. 查找子节点</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-%E5%85%84%E5%BC%9F%E5%85%B3%E7%B3%BB%E6%9F%A5%E6%89%BE"><span class="toc-number">1.2.3.</span> <span class="toc-text">3. 兄弟关系查找</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#1-%E4%B8%8B%E4%B8%80%E4%B8%AA%E5%85%84%E5%BC%9F%E8%8A%82%E7%82%B9"><span class="toc-number">1.2.3.1.</span> <span class="toc-text">1. 下一个兄弟节点</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#2-%E4%B8%8A%E4%B8%80%E4%B8%AA%E5%85%84%E5%BC%9F%E8%8A%82%E7%82%B9"><span class="toc-number">1.2.3.2.</span> <span class="toc-text">2. 上一个兄弟节点</span></a></li></ol></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-%E5%A2%9E%E5%8A%A0%E8%8A%82%E7%82%B9"><span class="toc-number">1.3.</span> <span class="toc-text">2. 增加节点</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E5%88%9B%E5%BB%BA%E8%8A%82%E7%82%B9"><span class="toc-number">1.3.1.</span> <span class="toc-text">1. 创建节点</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-%E8%BF%BD%E5%8A%A0%E8%8A%82%E7%82%B9"><span class="toc-number">1.3.2.</span> <span class="toc-text">2. 追加节点</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#1-%E6%8F%92%E5%85%A5%E5%88%B0%E7%88%B6%E5%85%83%E7%B4%A0%E7%9A%84%E6%9C%80%E5%90%8E%E4%B8%80%E4%B8%AA%E5%AD%90%E5%85%83%E7%B4%A0"><span class="toc-number">1.3.2.1.</span> <span class="toc-text">1. 插入到父元素的最后一个子元素:</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#2-%E6%8F%92%E5%85%A5%E5%88%B0%E7%88%B6%E5%85%83%E7%B4%A0%E4%B8%AD%E6%9F%90%E4%B8%AA%E5%AD%90%E5%85%83%E7%B4%A0%E7%9A%84%E5%89%8D%E9%9D%A2"><span class="toc-number">1.3.2.2.</span> <span class="toc-text">2. 插入到父元素中某个子元素的前面:</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#3-%E5%AD%A6%E6%88%90%E5%9C%A8%E7%BA%BF%E6%A1%88%E4%BE%8B%E6%B8%B2%E6%9F%93"><span class="toc-number">1.3.2.3.</span> <span class="toc-text">3. 学成在线案例渲染</span></a></li></ol></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-%E5%85%8B%E9%9A%86%E8%8A%82%E7%82%B9"><span class="toc-number">1.3.3.</span> <span class="toc-text">3. 克隆节点</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#4-%E5%88%A0%E9%99%A4%E8%8A%82%E7%82%B9"><span class="toc-number">1.3.4.</span> <span class="toc-text">4. 删除节点</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#3-%E6%97%B6%E9%97%B4%E5%AF%B9%E8%B1%A1"><span class="toc-number">1.4.</span> <span class="toc-text">3. 时间对象</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E5%AE%9E%E4%BE%8B%E5%8C%96"><span class="toc-number">1.4.1.</span> <span class="toc-text">1. 实例化</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-%E6%97%B6%E9%97%B4%E5%AF%B9%E8%B1%A1%E6%96%B9%E6%B3%95"><span class="toc-number">1.4.2.</span> <span class="toc-text">2. 时间对象方法</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#%E9%A1%B5%E9%9D%A2%E6%98%BE%E7%A4%BA%E6%97%B6%E9%97%B4"><span class="toc-number">1.4.2.1.</span> <span class="toc-text">页面显示时间:</span></a></li></ol></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-%E6%97%B6%E9%97%B4%E6%88%B3"><span class="toc-number">1.4.3.</span> <span class="toc-text">3. 时间戳</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E4%B8%89%E7%A7%8D%E6%96%B9%E5%BC%8F%E8%8E%B7%E5%8F%96%E6%97%B6%E9%97%B4%E6%88%B3"><span class="toc-number">1.4.4.</span> <span class="toc-text">1. 三种方式获取时间戳:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-%E6%AF%95%E4%B8%9A%E5%80%92%E8%AE%A1%E6%97%B6%E6%95%88%E6%9E%9C"><span class="toc-number">1.4.5.</span> <span class="toc-text">2. 毕业倒计时效果</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#4-%E9%87%8D%E7%BB%98%E5%92%8C%E5%9B%9E%E6%B5%81"><span class="toc-number">1.5.</span> <span class="toc-text">4. 重绘和回流</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E5%9B%9E%E6%B5%81-%E9%87%8D%E6%8E%92"><span class="toc-number">1.5.1.</span> <span class="toc-text">1. 回流(重排)</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-%E9%87%8D%E7%BB%98"><span class="toc-number">1.5.2.</span> <span class="toc-text">2. 重绘</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-%E9%87%8D%E7%BB%98%E4%B8%8D%E4%B8%80%E5%AE%9A%E5%BC%95%E8%B5%B7%E5%9B%9E%E6%B5%81-%E8%80%8C%E5%9B%9E%E6%B5%81%E4%B8%80%E5%AE%9A%E4%BC%9A%E5%BC%95%E8%B5%B7%E9%87%8D%E7%BB%98"><span class="toc-number">1.5.3.</span> <span class="toc-text">3. 重绘不一定引起回流, 而回流一定会引起重绘</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#4-%E9%87%8D%E7%BB%98%E5%92%8C%E5%9B%9E%E6%B5%81-%E9%87%8D%E6%8E%92-%E4%BC%9A%E5%AF%BC%E8%87%B4%E5%9B%9E%E6%B5%81%E7%9A%84%E6%93%8D%E4%BD%9C%EF%BC%9A"><span class="toc-number">1.5.4.</span> <span class="toc-text">4. 重绘和回流(重排) 会导致回流的操作：</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#5-%E5%8F%91%E5%B8%83%E5%BE%AE%E5%8D%9A%E6%A1%88%E4%BE%8B"><span class="toc-number">1.6.</span> <span class="toc-text">5. 发布微博案例</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%9C%AC%E8%8A%82%E5%8D%95%E8%AF%8D"><span class="toc-number">1.6.1.</span> <span class="toc-text">本节单词:</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/post/ds2s/" title="整个前端面试题"><img src="https://cdn1.tianli0.top/gh/web-xc/iMG/postss/vue.png" onerror='this.onerror=null,this.src="https://npm.elemecdn.com/webxc@1.0.2/banner/404.gif"' alt="整个前端面试题"></a><div class="content"><a class="title" href="/post/ds2s/" title="整个前端面试题">整个前端面试题</a><time 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